Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - Home Equity Loan, Credit Card and Other Asset-backed VIEs (Details)

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Securitizations and Other Variable Interest Entities - Home Equity Loan, Credit Card and Other Asset-backed VIEs (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
On-balance sheet assets        
Trading account assets $ 209,044,000,000   $ 180,209,000,000  
Debt securities carried at fair value 312,012,000,000   313,660,000,000  
Held-to-maturity securities 116,033,000,000   117,071,000,000  
Loans and leases 906,242,000,000   906,683,000,000  
Allowance for loan and lease losses (11,112,000,000) $ (12,069,000,000) (11,237,000,000) $ (12,234,000,000)
All other assets 115,705,000,000   120,709,000,000  
Total assets 2,247,701,000,000 2,185,726,000,000 2,187,702,000,000  
On-balance sheet liabilities        
Long-term debt 221,385,000,000   216,823,000,000  
Total liabilities 1,979,548,000,000   1,920,862,000,000  
Other than temporary impairment losses recorded on debt securities 27,000,000 7,000,000    
Home equity lines of credit | Unconsolidated VIEs        
On-balance sheet assets        
Unconsolidated total assets of VIEs 3,949,000,000   4,274,000,000  
Home equity lines of credit | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 2,453,000,000   2,732,000,000  
On-balance sheet assets        
Total assets 43,000,000   46,000,000  
Home equity lines of credit | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 139,000,000   149,000,000  
On-balance sheet assets        
Trading account assets 0   0  
Loans and leases 225,000,000   244,000,000  
Allowance for loan and lease losses (15,000,000)   (16,000,000)  
All other assets 6,000,000   7,000,000  
Total assets 216,000,000   235,000,000  
On-balance sheet liabilities        
Short-term borrowings 0   0  
Long-term debt 97,000,000   108,000,000  
All other liabilities 0   0  
Total liabilities 97,000,000   108,000,000  
Home equity lines of credit | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 43,000,000   46,000,000  
Held-to-maturity securities 0   0  
Home equity lines of credit | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 0   0  
Credit Card Receivable | Unconsolidated VIEs        
On-balance sheet assets        
Unconsolidated total assets of VIEs 0   0  
Credit Card Receivable | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 0   0  
On-balance sheet assets        
Total assets 0   0  
Credit Card Receivable | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 23,156,000,000   25,859,000,000  
On-balance sheet assets        
Trading account assets 0   0  
Loans and leases 33,125,000,000   35,135,000,000  
Allowance for loan and lease losses (980,000,000)   (1,007,000,000)  
All other assets 1,548,000,000   793,000,000  
Total assets 33,693,000,000   34,921,000,000  
On-balance sheet liabilities        
Short-term borrowings 0   0  
Long-term debt 10,527,000,000   9,049,000,000  
All other liabilities 10,000,000   13,000,000  
Total liabilities 10,537,000,000   9,062,000,000  
Residual interests held 13,900,000,000   17,600,000,000  
Credit Card Receivable | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 0   0  
Held-to-maturity securities 0   0  
Credit Card Receivable | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 0   0  
Resecuritization Trusts | Unconsolidated VIEs        
On-balance sheet assets        
Unconsolidated total assets of VIEs 18,792,000,000   22,155,000,000  
Resecuritization Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 9,557,000,000   9,906,000,000  
On-balance sheet assets        
Total assets 9,557,000,000   9,906,000,000  
Resecuritization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 282,000,000   420,000,000  
On-balance sheet assets        
Trading account assets 1,096,000,000   1,428,000,000  
Loans and leases 0   0  
Allowance for loan and lease losses 0   0  
All other assets 0   0  
Total assets 1,096,000,000   1,428,000,000  
On-balance sheet liabilities        
Short-term borrowings 0   0  
Long-term debt 814,000,000   1,008,000,000  
All other liabilities 0   0  
Total liabilities 814,000,000   1,008,000,000  
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 936,000,000   902,000,000  
Debt securities carried at fair value 2,181,000,000   2,338,000,000  
Held-to-maturity securities 6,342,000,000   6,569,000,000  
Resecuritization Trusts | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 27,000,000   27,000,000  
Debt securities carried at fair value 71,000,000   70,000,000  
Municipal Bond Trusts | Unconsolidated VIEs        
On-balance sheet assets        
Unconsolidated total assets of VIEs 2,336,000,000   2,406,000,000  
Municipal Bond Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,603,000,000   1,635,000,000  
On-balance sheet assets        
Total assets 23,000,000   0  
Municipal Bond Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 1,326,000,000   1,442,000,000  
On-balance sheet assets        
Trading account assets 1,325,000,000   1,454,000,000  
Loans and leases 0   0  
Allowance for loan and lease losses 0   0  
All other assets 1,000,000   0  
Total assets 1,326,000,000   1,454,000,000  
On-balance sheet liabilities        
Short-term borrowings 185,000,000   348,000,000  
Long-term debt 0   12,000,000  
All other liabilities 0   0  
Total liabilities 185,000,000   360,000,000  
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 23,000,000   0  
Debt securities carried at fair value 0   0  
Held-to-maturity securities 0   0  
Municipal Bond Trusts | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 0   0  
Other Securitization Trusts | Unconsolidated VIEs        
On-balance sheet assets        
Unconsolidated total assets of VIEs 169,000,000   174,000,000  
Other Securitization Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 46,000,000   47,000,000  
On-balance sheet assets        
Total assets 46,000,000   47,000,000  
Other Securitization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 0   0  
On-balance sheet assets        
Trading account assets 0   0  
Loans and leases 0   0  
Allowance for loan and lease losses 0   0  
All other assets 0   0  
Total assets 0   0  
On-balance sheet liabilities        
Short-term borrowings 0   0  
Long-term debt 0   0  
All other liabilities 0   0  
Total liabilities 0   0  
Other Securitization Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 46,000,000   47,000,000  
Held-to-maturity securities 0   0  
Other Securitization Trusts | Junior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0   0  
Debt securities carried at fair value 0   $ 0  
Home Equity Loan, Credit Card and Other Asset-backed Securitization Trusts | Unconsolidated VIEs        
On-balance sheet liabilities        
Other than temporary impairment losses recorded on debt securities 2,000,000 1,000,000    
Other than temporary impairment losses recorded on held-to-maturity securities $ 0 $ 0